Wash the beans well
Put them in the pressure cooker with the water and cook them for about 30 mins
In a pan, on medium heat, add the oil and cook the onion for about 3 mins
Once the beans are cooked, remove the lid of the pressure cooker, add the mixture of oil and onion to the cooked beans, add the rice, add the salt, the pepper and the tomato paste then mix everything
Place the mixture on low heat and keep mixing from time to time until the rice is fully cooked (15 to 20 mins)
Serve in 4 separated plates
